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Proceedings Paper

Modeling of a field-widened Michelson interferometric filter for application in a high spectral resolution lidar
Author(s): Dong Liu; Chris Hostetler; Anthony Cook; Ian Miller; Johnathan Hair
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Paper Abstract

High spectral resolution lidars (HSRLs) are increasingly being deployed on aircraft and called for on future space-based missions. The HSRL technique relies on spectral discrimination of the atmospheric backscatter signals to enable independent, unambiguous retrieval of aerosol extinction and backscatter. A compact, monolithic field-widened Michelson interferometer is being developed as the spectral discrimination filter for an HSRL system at NASA Langley Research Center. The interferometer consists of a cubic beam splitter, a solid glass arm, and an air arm. The spacer that connects the air arm mirror to the main part of the interferometer is designed to optimize thermal compensation such that the maximum interference can be tuned with great precision to the transmitted laser wavelength. In this paper, a comprehensive radiometric model for the field-widened Michelson interferometeric spectral filter is presented. The model incorporates the angular distribution and finite cross sectional area of the light source, reflectance of all surfaces, loss of absorption, and lack of parallelism between the air-arm and solid arm, etc. The model can be used to assess the performance of the interferometer and thus it is a useful tool to evaluate performance budgets and to set optical specifications for new designs of the same basic interferometer type.

Paper Details

Date Published: 6 December 2011
PDF: 10 pages
Proc. SPIE 8197, 2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 81971H (6 December 2011); doi: 10.1117/12.907546
Show Author Affiliations
Dong Liu, NASA Langley Research Ctr. (United States)
Chris Hostetler, NASA Langley Research Ctr. (United States)
Anthony Cook, NASA Langley Research Ctr. (United States)
Ian Miller, LightMachinery Inc. (Canada)
Johnathan Hair, NASA Langley Research Ctr. (United States)


Published in SPIE Proceedings Vol. 8197:
2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
Yongtian Wang; Yunlong Sheng; Han-Ping Shieh; Kimio Tatsuno, Editor(s)

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